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Entry  Sat Sep 10 14:55:28 2011, Keiko, Update, LSC, 3f demodulation board check 
    Reply  Sat Sep 10 16:10:42 2011, Keiko, Update, LSC, 3f demodulation board check REFL33-input-filter.png
       Reply  Sat Sep 10 18:57:52 2011, Keiko, Update, LSC, 3f demodulation board check 
          Reply  Sun Sep 11 15:19:39 2011, kiwamu, Update, LSC, phase delay in RF signals 
       Reply  Sun Sep 11 22:36:32 2011, Keiko, Update, LSC, 3f demodulation board check REFL33.pngREFL165.png
          Reply  Mon Sep 12 13:24:07 2011, Keiko, Update, LSC, 3f demodulation board check 
             Reply  Mon Sep 12 16:27:01 2011, Keiko, Update, LSC, 3f demodulation board check 
                Reply  Mon Sep 12 18:40:35 2011, Keiko, Update, LSC, 3f demodulation board check 
                   Reply  Tue Sep 13 15:00:25 2011, Keiko, Update, LSC, 3f demodulation board check WF33.pdfWF165.pdf
                      Reply  Tue Sep 13 23:08:51 2011, Keiko, Update, LSC, 3f demodulation board check REFL33-modified.pngREFL165-modified.png
                         Reply  Thu Sep 15 01:06:20 2011, Keiko, Update, LSC, 3f demodulation board check 
                            Reply  Fri Sep 16 21:26:12 2011, Keiko, Update, LSC, 3f demodulation board check 
Message ID: 5399     Entry time: Tue Sep 13 23:08:51 2011     In reply to: 5394     Reply to this: 5412
Author: Keiko 
Type: Update 
Category: LSC 
Subject: 3f demodulation board check 

Keiko, Jamie , Kiwamu

The I and Q orthogonalities of REFL33 and 165 demodulation board were measured by "orthogonality.py"  Python package scipy were addied on Pianosa to run this code. Please note that "orthogonality.py" can be run only on Pianosa.  

The results were:

REFL165

ABS = 1.070274, PHASE = -81.802479 [deg]

if you wanna change epics values according to this result, just copy and execute the following commands

ezcawrite C1:LSC-REFL165_Q_GAIN 0.934340 && ezcawrite C1:LSC-REFL165_PHASE_D -81.802479

- - - - - - - - - - - - - - - - - -

REFL33

ABS = 1.016008 PHASE = -89.618724 [deg]

if you wanna change epics values according to this result, just copy and execute the following commands

ezcawrite C1:LSC-REFL33_Q_GAIN 0.984244 && ezcawrite C1:LSC-REFL33_PHASE_D -89.618724


Fig.1 and 2  are the resulting plots for 33 and 165 MHz demod baoards, respectively.You should look at the 3Hz in x axis, as the demodulated signal frequency was set as 3 Hz.REFL33-modified.png

Fig. 1 REFL33 I and Q orthogonality at 3 Hz.

REFL165-modified.png

 

Fig. 2 REFL165 I and Q orthogonality at 3 Hz.

 

 

 

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